Hi Pho,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on usb-serial/usb-next]
[also build test WARNING on usb/usb-testing tty/tty-testing v5.12-rc6 next-20210401]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Pho-Tran/USB-serial-cp210x-Add-support-for-GPIOs-on-CP2108/20210406-182022
base:   https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial.git usb-next
config: i386-randconfig-s001-20210406 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-279-g6d5d9b42-dirty
        # https://github.com/0day-ci/linux/commit/850a69bacbd236b7bbdadfa4007e7f13b3c79471
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Pho-Tran/USB-serial-cp210x-Add-support-for-GPIOs-on-CP2108/20210406-182022
        git checkout 850a69bacbd236b7bbdadfa4007e7f13b3c79471
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/usb/serial/cp210x.c:1540:15: sparse: sparse: cast to restricted __le16

vim +1540 drivers/usb/serial/cp210x.c

  1496	
  1497	static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
  1498	{
  1499		struct usb_serial *serial = gpiochip_get_data(gc);
  1500		struct cp210x_serial_private *priv = usb_get_serial_data(serial);
  1501		u8 req_type = REQTYPE_DEVICE_TO_HOST;
  1502		int result;
  1503		u16 buf;
  1504	
  1505		result = usb_autopm_get_interface(serial->interface);
  1506		if (result)
  1507			return result;
  1508	/*
  1509	 * This function will be read latch value of gpio and storage to buf(16bit)
  1510	 * where bit 0 is GPIO0, bit 1 is GPIO1, etc. Up to GPIOn where n is
  1511	 * total number of GPIO pins the interface supports.
  1512	 * Interfaces on CP2102N supports 7 GPIOs
  1513	 * Interfaces on CP2103 amd CP2104 supports 4 GPIOs
  1514	 * Enhanced interfaces on CP2105 support 3 GPIOs
  1515	 * Standard interfaces on CP2105 support 4 GPIOs
  1516	 * Interfaces on CP2108 supports 16 GPIOs
  1517	 */
  1518		switch (priv->partnum) {
  1519		/*
  1520		 * Request type to Read_Latch of CP2105 and Cp2108
  1521		 * is 0xc1 <REQTYPE_INTERFACE_TO_HOST>
  1522		 */
  1523		case CP210X_PARTNUM_CP2108:
  1524			req_type = REQTYPE_INTERFACE_TO_HOST;
  1525			result = cp210x_read_vendor_block(serial, req_type,
  1526							CP210X_READ_LATCH, &buf, sizeof(__le16));
  1527			break;
  1528		case CP210X_PARTNUM_CP2105:
  1529			req_type = REQTYPE_INTERFACE_TO_HOST;
  1530			result = cp210x_read_vendor_block(serial, req_type,
  1531							CP210X_READ_LATCH, &buf, sizeof(u8));
  1532			break;
  1533		default:
  1534			result = cp210x_read_vendor_block(serial, req_type,
  1535							CP210X_READ_LATCH, &buf, sizeof(u8));
  1536			break;
  1537		}
  1538		if (result < 0)
  1539			return result;
> 1540		buf = le16_to_cpu(buf);
  1541		usb_autopm_put_interface(serial->interface);
  1542		return !!(buf & BIT(gpio));
  1543	}
  1544	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org